After an elevation of his PSA,the patient has blood drawn for a CA-19-9.When he asks the nurses the purpose of this new test,what is the most appropriate response?

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CA-19-9 is a tumor marker primarily used to monitor treatment response and recurrence in patients with pancreatic cancer, which is part of the hepatobiliary system. It is not specific for diagnosing cancer but can be elevated in other hepatobiliary cancers as well.

After an Elevation of His PSA,the Patient Has Blood Drawn